Selectable 1, 7 or 32 day chart rotation. Select speed with the flip of a switch. Lightweight, corrosion-resistant acrylic housing for indoor or sheltered outdoor use. Battery powered models have a low battery indicator and quartz-controlled drives that consistently rotate chart drum even when power is running down. Dimensions: 13.3”W x 11.5”H x 5.9”D. 1 year warranty.

Comes with one blue and one red pen, one 7-day rotation chart, one roll of 1-month paper and two C batteries.

Specifications
Ranges: 5 to 90% RH, -10 to 50°C/14 to 122°F
Accuracy: ±3% from 10 to 90% RH;
±5% from 5 to 10% RH
±1°C/±1.8°F
Chart graduations: 1% RH, 1°C/2°F